GNU bug report logs - #44340
27.1; describe-text-properties: [Show] when nothing to show

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1; describe-text-properties: [Show] when nothing to show
Date: Sat, 31 Oct 2020 18:26:34 +0800

In a Gnus *Article* buffer, place the cursor on
an attachment, and do M-x describe-text-properties .

   Here is a ‘button’ button labeled ‘[4. image/jpeg; Screenshot_20201030-160838.jpg]...’.

   There are text properties here:
     article-type         annotation
     button               (t)
     category             default-button
     face                 gnus-button
     follow-link          t
     gnus-callback        gnus-mm-display-part
     gnus-data            [Show]
     gnus-face            t
     gnus-part            4
     help-echo            "mouse-2: toggle the MIME part; down-mouse-3: more options"
     keymap               [Show]
     mouse-face           highlight
     rear-nonsticky       t

OK, that's great. However clicking on [Show] just flashes the screen.
C-h e doesn't reveal why, either.
At least print a message.

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